Warp stop-motion for looms.



v 'PATENTED DEG. 20, 1904. A. A'. JOHNSON. I WARP STOP MOTION FOR LOOMS.

APPLICATION nun APR. 4, 1904.

no MODEL I #4 ATTORNEY 7 f UNITED STATES v Patented December 20, 1904.

PATENT O FICE.

ALLAN A. JOHNSON, OF YNATIC, RHODE ISLAND, AssleNon TO KIP-- ARMSTRONG COMPANY, OF NEW OF YORK.

WARP sToP-MorioN'FoR LOOMS.

YORK, N. Y., A CORPORATION SPECIFICATION forming part of Letters Patent No. 778,132, d'ated'December 20, 1904.

Application filed April 4, 1904. Serial No. 201,518.

To all whom it may concern.-

1 The present invention relates to warp stopin Warp Stop-Motions for Looms, of

'Be it known'that I, ALLAN A. JOHNSON, a citizen of the United States, and a resident of N atic, in the State of Rhode Island, have invented certain new and useful Improvements which the following is a specification.

motions for looms, and more particularly to the mechanism for releasing the shipper-lever,

'- and will be understood by reference to the 4 accompanying drawings, in which- .xframe of. the loom; 2, the lay; 3, the breastbeam; 4, the shipper-lever; 5, the warps; 6,

the warp-beam; 7, thereed, and 8 the heddles. These parts may be and are of the usual construction and arrangement in looms. The

- shipper-lever, as usual, occupies a slot' 9 in a bracket 10,'forming an extension of the breastbeam, and engages, when the loom is running, ashoulderll. When freed from this shoulder, a spring (not. shown) shifts the shipper-lever to stop the loom. In order to setthe shipper-lever free, an electromagnet 12 is mounted below the breast-beam on a bracket 13, secured by suitable means to the loom-frame, and its armature-lever 14: is con-i nected by a link or wire rod 15 to one end of a dagger 16. Pivotally supported by pins or studs 17 in a bracket 18, secured to the loomframe, is a knock-off lever 19, attached at its lower end to the dagger 16 and its upper end adapted to engage the shipper-lever' l. When the magnet 12 is energized, the dagger 16 is moved into such position as to be impinged upon by a bunter 20, mounted on the, lay or some other vibrating or moving part of the loom. The impingement of the bunter on the dagger moves the knock-off lever to free the shipper-lever, as will be readily understood, and permits the latter to act to. stop the loom. I 1

In order to energize the electromagnet 12, and thus set in motion the loom-stopping devices whenever a warp-thread breaks or becomes unduly slack, a controlling-circuit 21 is employed. This circuit includes the coils of said magnet and a generator, and it has its terminals. and circuit-closing devices situated bar called a compound terminal. This compound terminal consists of a bar-terminal of the controlling-circuit, and with it the drops are at all times or normally in contact, and of a metal strip forming the other terminal of the controlling-circuit and setin, but insulated from the other or bar terminal.

the'drop suspended thereon falls and closes the controlling circuit through the electromag- When the warp-thread breaks or becomes unduly slack,-

net. The circuit 21 also includes a switch 23 i of any usual or well-known type, having contact-plates by which the circuit may be opened or closed. As here shown, the switch is supported upon a bracket 13 and is provided with a sWitch-lever2 i in contact with and; adapted to be moved by a projecting arm 25,

scribed, to stop the'loom', and as said lever is shifted the switch-lever 24: is moved, so as to immediately, after the loom has been stopped, break the circuit throughswitch 23. The circuit is therefore closed solely for the purpose of shifting the shipper-lever, and when that work has been done the circuit is broken.

: its outer end either raised or lowered to bring a in Fig. 3, being a suflicient distance from the When the loom is again set in motion, the break in the circuit at the switch 23 will be closed.

In looms of this character the hunter for impinging upon the dagger has usually been a solid projecting block or finger which did not provide a very wide range of action, and in practice it has been found that a slight bending or displacement of the link or wire rod 15 and the consequent displacement of the dagger from its normal position, whether intentional or accidental, results in the dagger being held out of the path of the hunter when the electromagnet is energized upon the breaking or undue slackening of a warp-thread. Consequently the loom is not knocked off, and the cloth is imperfect. To overcome the objections incident to the ordinarily-used form of hunter, I have devised one whereby any deviation of the dagger from its normal position when the loom is running will cause it to be impinged upon by the hunter, resulting immediately in shifting the shipper-lever to stop the loom.

One embodiment of my invention is illustrated in Fig. 3, in which the hunter 20 is formed with a base, by which it may be attached to the lay or other moving part of the loom, and a projecting body portion having side walls 26 and face 27. The hunter is preferably formed of a casting and is recessed through the face at 28 a sufficient depth to permit the dagger 16 to pass freely into the same without impinging during the normal running of the loom. When the electromagnet is energized, the dagger will be drawn out of the path of the recessed portion of the hunter and will he impinged upon by the face 27. If desired, the said face may he provided with grooves 29 to prevent the dagger sliding on the face and to insure a good contact. It is obvious that any slight intentional bending of the link or wire rod 15, so as to cause the dagger to escape the recess 28, would result in the knocking off of the loom, and any such bending suflicient to cause the dagger to escape the hunter altogether could easily be detected. Such detection in the forms of hunters commonly used is diflicult, if not impossible. I thus provide a means by which any unwarranted interference with the proper working of the stop-motion by the weaver is either prevented or its detection assured.

Fig. 1 shows a slightly-modified form of hunter in that the casting may be made by omitting one of the side walls, the face 27, as

base as to prevent impingement against the dagger during the running of the loom.

The dagger may be so positioned as to have it into the path of the face of the hunter when the electromagnet 12 is energized as described in United States Patent No. 713,836, dated I November 18, 1902, to IV. H. Baker and Frederic E. Kip; also, as described in that patent and in United States Patent N 0. 711,951, dated October 20, 1903, to the same parties, the dagger 16, armature-lever 14c, and their connecting parts may be nearly balanced and actuated by gravity to put the parts in their normal or inoperative positions. If desired, however, springs may be employed to restore the parts to their normal positions when the elec tromagnet 12 is deenergized; also, the switchlever 24 may he provided with a spring to restore it to its normal position when the loom is started by moving the shipper-lever into engagement with shoulder 11.

As shown in Fig. 2, the brackets 13 and 13 for supporting the magnet and switch, respectively, are cast in a single piece and bolted to the loom-frame. The dagger 16 may also be mounted on a portion of the same casting, and by so doing these parts may be applied to the loom complete.

Being the first to employ in a warp stopmotion a device which prevents the operative from interfering with the effectiveness of the knocking-off device, I desire to claim the same broadly without reference to the special means for accomplishing the result. It is also understood that the device is adapted to a mechanical as well as to an electrical warp stopmotion.

Vhat I claim, and desire to secure by Letters Patent, is*

1. A stop-motion for looms comprising a dagger, a hunter having a recess of suiiicient depth to permit said dagger to enter freely therein when the dagger is in its normal position, and an impinging face to cause the loom to knock off when the dagger is moved from its normal position.

2. A stop-motion forv looms comprising a dagger, and a hunter having a recess of suiiicient depth to permit said dagger to enter freely therein when the dagger is in its normal position, and an impinging face whereby a slight displacement of the dagger from its normal position will cause the loom to knock off and also whereby any displacement of the dagger to escape the hunter may be readily detected.

3. A hunter for use on looms having a body portion with a recess of suflicient depth to permit a dagger to enter freely therein when the dagger is in its normal position, and an impinging face whereby the loom will knock off. upon any slight displacement of the dagger from its normal position and whereby any unusual displacement may be readily detected.

1. A stop-motion for looms comprising a dagger, an electric circuit including a magnet, an armature therefor, a link connecting said armature and dagger, a hunter on a moving part of the loom, said hunter having a recess of suiiicient depth to permit said dagger to from wilfully displacing the dagger to thereby allow the loom to run consisting of'a bunter having a body portion with a recess of suflicient depth to permit the dagger to enter therein during the normal running of the loom and an impinging face, and means when said circuit is closed for moving the dagger into position to strike the impinging face of the hunter to thereby stop the loom.

6. A hunter for use on looms having a body portion with a recess of suflicient depth to permit a dagger to enter freely therein when the dagger is in its normal position, and a surrounding impinging face.

7. A hunter for use on looms having a body portion with arecess of sufficient depth to permit a dagger to enter freely therein when the dagger is in its normal pcsltion, and a grooved surrounding impinging'face.

8. A hunter for use on looms havlng a body portlon w1th a substantially central recess therein of a depth sufficient to permit a dagger to enter freely therein when the dagger is in its normal position, and a surrounding impinging face.

9. The combination with a warp stop mech-- anism for looms, of a shipper-lever and means to release the same to stop the loom comprising a dagger, means connecting said shipperlever'and dagger, a hunter on a moving part of the loom, said hunter having a body por tion with a recess of sufficient depth to permit said dagger to enter freely into said recess when the dagger is in its normal position and a surrounding impinging face, and means to move said dagger into the path of the impinging face of the hunter upon the breakage or undue slackness of a warp-thread.

10. The combination in a warp stop mechanism for looms, of a shipper-lever and means to release the same to stop the loom comprising a dagger, a knock-off lever secured to said dagger and adapted to engage said shipperlever,'a hunter on a moving part of the loom, said bunter havinga body portion with a recess of sufiicient depth to permit said dagger to enter freely into said recess when the dagger 1s 1n its normal pos1t1on-and a surrounding impinging face, and means to move saiddagger into the path of the impinging faceof the hunter upon the breakage or undue slack ness of a warp-thread.

In Witness whereof I have hereunto signed my name in the presence of two subscribing Witnesses.

ALLAN A. oHNson.

Witnesses:

FRED. M. ARMSTRONG, FREDERIC W. ENTWISTLE. 

